Screening device



` F. M. MocoRKEl. ETAL 3,070,231

Dec. Z5, 1962 I SCREENING DEVICE 4 Sheets-Sheet 1 Filed Nov. 2:5. 1959 Dec. 25, 1 962 v F.'M. MccoRKEl. ETAL 3,070,231

A SCREENING DEVICE Filed Nov. 25. 1959 4 Sheets-Sheet 2 FIGJZ Dec. 25, 1962 F M, MccoRKEL ETAL 3,070,231

* SCREENING DEVICE l Filed Nov'. 2s, 195 4 sheets-sheet s FIG.3

Dec. 25, 1962 F. M. MccoRKEL r-:rAL 3,070,231

SCREENING DEVICE 4 Sheets-Sheet 4 Filed Nov. 23. 1959 United States Patent Utilice 3,070,231 Patented Dec. 25, 1962 3,070,231 SCREENING DEVICE Franklin M. McCorkel and Verne R. Healy, Manheim Township, Lancaster County, Pa., assignors to Aggregates Equipment, Inc., Leola, Pa., a corporation of Pennsylvania Filed Nov. 23, 1959, Ser. No. 854,806 laims. (Cl. 209-319) This invention relates to a screening device and more particularly to a device which is capable of screening materials into a plurality of grades on each deck of a multiple deck screening device.

It has been common practice in the building of devices ot this type to have the screens of the same mesh span the entire distance from one side of the device to the other side. With this arrangement the material placed on the top screen either passes through the screen or is retained thereon. The same opera-tion takes place on the second screen and so on down through the device. In each case the material retained on the screen passes oi the end of the screen through suitable chutes into storage bins. With this type of equipment it is not possible to obtain more grades of material from a screening device than there were screens because no means had been devised for dividing the screen lengthwise. Several devices have been used in which the bottom screen was divided crosswise to get a plurality of grades of material from the bottom deck. Because of the removal problem this system could not be used on the upper decks. Attempts have also been made to provide half screens immediately beneath the upper decks of screening devices.

The invention here under consideration is the first in which there is disclosed a device -in which screens of different mesh sizes can be arranged side by side on a given deck of a multiple deck screening device, with each section of screen of a given size extending from one end of the deck to the other.

Y With the invention here under consideration, a three deck unit can be utilized to screen a given mixture into as many separate yranges as desired. This is accomplished by dividing each deck longitudinally and placing screens of different mesh size on each deck. These individual screens `are separated `from one another by a longitudinal divider to which the screens are attached.

It is an object of this invention to provide a screening device in which the number of diferent size screens running the full length of the decks is greater than the number of decks present on the apparatus.

Another object of this invention is to provide means for securing the edges of the screens to a divider and for placing the screen under tension by an adjustable clip in engagement with the screen edge adjacent the side plate ofthe device.

In order for our invention to be more readily understood, it will be described in connection with the attached drawings, in which- FIGURE l is a side elevational View of the screening device of our invention;

FIGURE 2 is a front elevational view of the device;

v FIGURE 3 is an exaggerated view of the hook arrangement of the edge of the screen;

FIGURE 4 is a detailed View of the clip arrangement for securing the screen to the central divider; and FIGURE 5 is a detailed view of a modilication of the screen divider arrangement.

Referring to FIGURE l, there is shown the screening device 2 mounted on the bases 3 by means of coil springs 4. This invention is applicable in any screening device oi this type regardless of the mounting system. For example the device may be suspended rather than mounted Ias here shown. The gyratory motion is imparted to the device 2 lby means of the eccentric 5 mounted on the top of the machine and driven from a motor 6 through belt 7 and pulley S. The magnitude of gyration of the device is determined bythe weight ofthe eccentric 5. The gyration causes the body 2 to bounce on the springs 4. The weight of the eccentric 5 determines the magnitude of the stroke of the device. The mechanism for imparting gyratory motion to the device is old in the art and is not a part of this invention.

Referring to FIGURE 2, there are shown two side plates 9 and 10. Suitable cross members 12 sp-an the area between the side plates and define the position of the three decks and the screens. In the embodiment here under consideration the dividers lil are secured to these cross members. The dividers 11 extend longitudinally through the device parallel to the two side plates 9 and 10 at each of the three deck levels. The side plates 9 and 10l in the embodiment here shown are mounted on an incline and the dividers 11 running longitudinally through the device are on the same incline, placing the screens on the same incline. It Will be understood, of course, that the invention can also be utilized in those cases where the `screens are on 4a horizontal plane as Well as an inclined plane. Several cross members 12 are shown spanning the area between the side plates 9 and 10 but are positioned above the top deck.

The screens are designated by the numeral 13 and for purposes of illustration the screen 13 is of a size having squares lfour inches on a side. The screen size varies in the `order of 13 to 13a, 13b, 13e, 13d to 13e which is about a quarter inch on a side. These screen sizes are merely given as typical of usable sizes and are in n-o Way meant to be limiting.

The individual screens are secured to the side plates 9 and 10 and to the divider 11. This is accomplished by means of upturned hooks or flanges 14 along the edges of the screens 13. (See FIGURE 3.) These hooked or flanged edges `extend the entire length of the screens 13.

A plurality of tubular members 15 are welded to the dividers 11 in axial alignment along each divider on both sides thereof. An angular clip member 16 extends the entire length of the screen and is adapted to have a portion 17 engage the hook lor ilange 14 secured to the edge of the screen. Secured to the inner portion of the angular clip member 16 are a plurality of intermittent housings 18 (see FIGURE 4). These housings 18 are also in axial alignment with one another and are intermittently spaced so that when the clip 16 is in position with its bottom portion 17 in engagement with the hook 14 on the edge of the screen and the top edge in engagement with the divider 11, the tubular members 15 and the housings 18 are all in axial alignment so that a rod inember 19 may be slipped through the aligned elements securing the clip member 16 -to the divider 11.

The side of the screen 13 which is disposed adjacent the side plate is provided with the same type of a hooked or flanged edge 11i. A three sided longitudinal clip 20 is placed in engagement with the hook so that when the bottom flange 21 of the clip 20 is in engagement with the hook 14 and the top side 22 is in engagement with the interior oi: the side plates 9 and 10, the intermediate area 23 is on a plane substantially parallel to the side plates 9 and 1t). Welded to this flat portion 23 are a plurality oi bolts 24 extending through openings 25 in the side plates 9 and 10. Nuts 26 are in threaded engagement with these bolts on the outside of the side plates 9 and lil. In place of the nut and bolt arrangement, other fastening means capable of placing the screen under tension may be used. With this arrangement, when the nuts 26 are tightened, clips 20 pivot about this upper edge urging the lower extremity 21 toward the inner surface of the side plates 9 and 10 carrying with it the hooked edge 14 of the screen 13. This stretches the screen 13 between the fastening arrangement with the divider described earlier and the clip 20. Screen support rods 27 are provided to engage the central portion of the screen and support it approximately midway between the two sides ofthe individual screens.

When it becomes necessary or desirable to place another screen in the device, it is only necessary to loosen nuts 25 which allows the tension to be released from the screen 13. When this is done, the entire screen can be slipped out the end 28, FIGURE 1, of the device by merely having the hooks 14 slide along the clip edges 17 and 21. In the event dust and dirt has packed around the assembly at the divider preventing sliding of the screen, the entire assembly can be readily taken apart by merely withdrawing the rod 19 thereby making it possible to remove the entire clip 16. This frees the hook edge 14 of the screen 13. In the event it becomes necessary to replace parts due to wear, the assembly lends itself to rapid removal and replacement.

The smaller mesh screens are, of course, made of thinner material than the larger mesh screens and therefore it may be necessary to have dierent size edge hooks 14 on the screens. This is illustrated in FIGURE 3 in which the assembly on the left has a heavier screen size than the assembly on the right. It will be observed that regardless of the screen size within reasonable limits the assembly attaching the screen to the divider 11 is so designed as to accommodate the screen edge.

In the modification illustrated in FIGURE the invention is shown with more than one longitudinal divider 11 per deck, making it possible to provide three or more screens extending the entire length of the device on each deck. In this embodiment the dividers 11 are not secured to the cross members 12 but merely rest thereon for limited crosswise movement as the screens are placed under tension and released. With this arrangement the means for fastening the screens to the dividers is the same as described earlier. The only diterence is that the entire screen assembly is placed under tension between the two side plates whereas in the earlier description the individual screens were placed under tension between a fixed divider and one side plate. It will be understood too that ixed and movea-ble dividers can lbe used in cornbination in the same assembly. In this case the screens can be placed under tension between a fixed divider and a side plate with intermediate movable dividers.

In the operation of the device the material to be screened is dumped on the top deck from a conveyor or hopper as the case may be. The material falling on screen 13 will be separated by reason of the particles which are smaller than the mesh of screen 13 passing through the `screen on to screen 13b. The material which passes through screen 13b goes down on to screen 33d. All of the materials which do not pass through the respective screens move off through the chutes 29 at the bottom end of the inclined deck. The materials so removed are conveyed to suitable segregated storage bins. The placing of the dividers is so arranged as to give the desired percentage of grades of stone. For example the dividers may be positioned so that screens 13, 13C and 13d will span 2/a the area between the two side plates or whatever area is desired to fulfill requirements.

It will be observed from this arrangement that we have provided a screening device in which at least two sizes of screen are available on each deck extending longitudinally the entire length of the deck.

We claim:

l. In a device of the type described, elements comprising a pair of resiliently mounted parallel side plates, a plurality of longitudinal dividers running parallel to said side plates and spaced therebetween, a plurality of screens spanning the area between the side plates and the dividers, a ange on each edge of said screens adjacent the side plates and the dividers, a plurality of tubular members secured to said dividers in axial alignment with one another in close proximity to said flange, a clip extending the length of the dividers and being provided on its inner surface with a plurality of intermittent housings in axial alignment with one another and with the tubular elements on said divider when said clip is in engagement with said liange and the divider, means for holding said tubular elements on the divider and said intermittent housings on the clip in alignment, a second clip for engagement with the other ange of said screen, said second clip being provided with drawing members passing through openings in said side plate, and means for tightening said clip against said side plate to place said screen under tension.

2. In a device of the type described, elements comprising a pair of resiliently mounted parallel side plates, a plurality of longitudinal dividers running parallel to said side plates and spaced therebetween, said dividers being on a vertical plane, a plurality of screens spanning the area between the side plates and dividers, said screens being arranged so that one-half of them span the area between one side plate and the dividers and the remainder of the screens span the area between the other side plate and the dividers, a flange on each edge of said screens adjacent the side plates and the dividers, a plurality of tubular members secured to said dividers in axial alignment with one another in close proximity to said ange, a clip extending the length of the dividers and being provided on its inner surface with a plurality of intermittent housings in axial alignment with one another and with the tubular members on said divider when said clip is in engagement with the flange of the screen and the divider, a rod passing through the tubular members on the divider and the intermittent housings to hold them in alignment, a second clip for engagement with the other upturned flange of said screen, said second clip being provided with drawing members passing through openings in said plate, and means for drawing said second clip away from said divider to place said screens under tension between the dividers and the side plates.

3. In a device of the type described elements comprising a pair of resiliently mounted parallel side plates, a longitudinal divider running parallel to said side plates and spaced therebetween, a screen spanning the area between one side plate and the divider and a second screen spanning the area between the divider and the other side plate, a flange on each edge of said screens adjacent the side plates and the divider, a plurality of tubular elements secured to each side of the divider in axial alignment with one another in close proximity to said flanges, a pair of clips, one on each side of said divider and extending the length thereof, the inner side of said clips being provided with intermittent housings in axial alignment with one another and in alignment with the tubular elements on said divider when the clip is in engagement with the flange of the screen and the divider, a rod adapted to pass through the tubular elements on the divider and the intermittent housings to hold them in alignment and secure the screens to the divider, clip means for engagement with the flange on the opposite side of the screen, means attached to said second clip for drawing said second clip away from said divider to place the screen under tension.

In a device of the type described elements comprising a pair of resiliently mounted parallel side plates, a plurality of longitudinal dividers arranged on a vertical plane between said side plates and parallel to said side plates, screens spanning the area between the side plates and the dividers the arrangement being such that screens of varying size mesh are disposed one on top of the other on each side of the dividers, a flange on each longitudinal edge of said screens adjacent the side plates and the dividers, a plurality of tubular elements secured to each side of the divider in axial alignment with one another in close proximity to said ange, clips for engagement with the divider and the anges on the screen and extending throughout the length thereof, the inner side of said clips being provided with intermittent housings in axial alignment with one another and with the tubular elements on the divider when the clip is in engagement with the flange and the divider, a rod adapted to pass through the tubular elements on the divider and the intermittent housings to hold them in alignment and secure the screen to the divider, clip means for engagement with the ange on the opposite side of the screen, means attached to said second clip for drawing said second clip away from said divider to place the screen under tension.

5. In a device of the type described elements comprising a pair of resiliently mounted parallel side plates, a longitudinal divider running parallel to said side plates and spaced therebetween, a screen spanning the area between the side plate and the divider and a second screen spanning the area between the divider and the other side plate, said screens being provided with anges of diierent size, a plurality of tubular elements secured to each side of the divider in axial alignment with one another, a pair of clips one on each side of said divider and extending the length thereof, the inner side of said clips being provided with intermittent housings in axial alignment with one another and in alignment with the tubular elements on said divider regardless of the varying thickness of the flanges when the clip is in engagement with the flange and the divider, a rod adapted to pass through the tubular elements on the divider and the intermittent housings to hold them in alignment and secure the screen to the divider, clip means for engagement with the flange on the opposite side of the screen, means attached to said second clip for drawing said second clip away from said divider to place the screen under tension.

References Cited in the le of this patent UNITED STATES PATENTS Re. 12,459 Anderson Feb. 27, 1906 249,056 Iebb Nov. l, 1881 417,907 Coplen Dec. 24, 1889 1,009,069 Hunnicutt Nov. 21, 1911 2,479,945 Lincoln Aug. 23, 1949 2,630,225 Bye Mar. 3,1953 

